# std::istreambuf_iterator<CharT,Traits>::istreambuf_iterator

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< cpp‎ | iterator‎ | istreambuf iterator

| (1) |
istreambuf_iterator() throw(); |  | (until C++11)
constexpr istreambuf_iterator() noexcept; |  | (since C++11)
constexpr istreambuf_iterator( std::default_sentinel_t ) noexcept; | (2) | (since C++20)
| (3) |
istreambuf_iterator( std::basic_istream<CharT,Traits>& is ) throw(); |  | (until C++11)
istreambuf_iterator( std::basic_istream<CharT,Traits>& is ) noexcept; |  | (since C++11)
| (4) |
istreambuf_iterator( std::basic_streambuf<CharT,Traits>* s ) throw(); |  | (until C++11)
istreambuf_iterator( std::basic_streambuf<CharT,Traits>* s ) noexcept; |  | (since C++11)
| (5) |
istreambuf_iterator( const /* proxy */& p ) throw(); |  | (until C++11)
istreambuf_iterator( const /* proxy */& p ) noexcept; |  | (since C++11)
istreambuf_iterator( const istreambuf_iterator& ) noexcept = default; | (6) | (since C++11)

1,2) Constructs an end-of-stream iterator.
3) Initializes the iterator and stores the value of is.rdbuf() in a data member. If is.rdbuf() is null, then end-of-stream iterator is constructed.
4) Initializes the iterator and stores the value of s in a data member. If s is null, then end-of-stream iterator is constructed.
5) Effectively call (3) with the `streambuf_type*` pointer p holds.
6) The copy constructor is trivial and explicitly defaulted.

The copy constructor is effectively implicitly declared and not guaranteed to be trivial. | (until C++11)

### Parameters

is | - | stream to obtain the stream buffer from
s | - | stream buffer to initialize the iterator with
p | - | object of the implementation-defined proxy type

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